What has me the most concerned, is the fact that, well, it doesn't make much sense to me. Would a slow / small leak (such as those caused by a cracked rubber hose / leaky check valve / etc) really cause such a massive vacuum loss, that it would knock out the whole system? It just seems kind of strange to me.

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(Oo{=|=}oO) 1983 MB 300D USA, 212,000mi. 80's yellow/white. "Gunther"
(Oo{=|=}oO) 1984 MB 300D Euro, Turbo Added in Germany, 186,000mi [SOLD] Missing her dearly.
(Oo{=|=}oO) 1984 MB 300D USA Turbodiesel, 269,000mi. [SOLD]